Nuclear Analytical Techniques
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. ANÁLISE DE AMOSTRAS DE COMBUSTÍVEIS POR FOTOMETRIA, NIR PORTÁTIL E RMN DE 1H - UMA COMPARAÇÃO COM OS RESULTADOS ENCONTRADOS POR TÉCNICAS NORMATIZADAS
It has been recurring adulterations in fuels (such as gasoline, ethanol and diesel), being necessary the exploration of the use of more modern analytical techniques capable of controlling the quality of these fuels, since some regulated tests may be inefficient to detect the adulteration. Among them, it is highlighted proton nuclear magnetic resonance (1H NM
Quím. Nova. Publicado em: 2020-02
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2. Influence of Seasonality and Sunlight Effects on Rollinia mucosa Leaves Fingerprint
Rollinia mucosa fruit has generated great interest due to the presence of bioactive compounds, which exhibit promising biological activities. Fingerprinting analytical techniques, chromatographic-diode array detection (DAD), infrared, mass spectrometric, 1H and 13C nuclear magnetic resonance (NMR) spectra, associated with chemometric analysis and mixture des
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
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3. APCI(+)FT-ICR MS Analysis of Hydrocarbons Using Isooctane as Ionizing Reagent - A Comparison with HTGC-FID, GC×GC-MS and NMR
Hydrocarbons present in saturated fractions of crude oils can be assessed by atmospheric pressure chemical ionization (APCI) using small hydrocarbons as ionizing reagents in a Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS). In this work, five paraffin standards of different average molar mass distributions (Mw) were easily ionized by
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
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4. Heteropoly Tungstate Supported on Metal Oxide Catalysts for Liquid Phase Oxidation of Benzyl Alcohol with Hydrogen Peroxide
A series of metal oxide supported tungstophosphoric acid catalysts were prepared by impregnation. The physicochemical and acidic properties of these materials were characterized by a variety of different analytical and spectroscopic techniques, namely Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) method
J. Braz. Chem. Soc.. Publicado em: 2018-01
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5. Metabolomics as a promising tool for early osteoarthritis diagnosis
Osteoarthritis (OA) is the main cause of disability worldwide, due to progressive articular cartilage loss and degeneration. According to recent research, OA is more than just a degenerative disease due to some metabolic components associated to its pathogenesis. However, no biomarker has been identified to detect this disease at early stages or to track its
Braz J Med Biol Res. Publicado em: 21/09/2017
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6. Uso da RMN como um sensor online em processos industriais
Nuclear magnetic resonance (NMR) is one of the most versatile analytical techniques for chemical, biochemical and medical applications. Despite this great success, NMR is seldom used as a tool in industrial applications. The first application of NMR in flowing samples was published in 1951. However, only in the last ten years Flow NMR has gained momentum and
Quím. Nova. Publicado em: 2012
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7. Implementação e aplicação de metodologia para dosagem de metais e não metais em águas de drenagem de solo adubados com fosfogesso
Phosphogysum is a waste generated in phosphoric acid production by the wet process. The immense amount of phosphogysum yearly produced (around 150 million tons) is receiving attention from environmental protection agencies all over the word, given its potential of contamination. In Brazil, this material has been used for many decades, especially for agricult
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/04/2010
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8. Caracterização química elementar e identificação de fontes de obsidianas utilizando fluorescência de raios X com equipamento portátil (PXRF)
The study of archaeological and cultural heritage artifacts by means of analytical techniques with portable equipment has become increasingly routinely today. Various types of portable EDXRF equipment have been used in many different situations involving in situ analysis covering a wide range of geometries, detectors, current and voltage applied in the X-ray
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/03/2010
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9. Ki-1/57 e uma proteina intrinsecamente desordenada envolvida em mecanismos de regulação genica / Ki-1/57 is an intrinsically disordered protein involved in mechanisms of gene regulation
The Ki-1/57 protein has been discovered through the cross reactivity of the monoclonal antibody Ki-1 in Hodgkin lymphoma cells. Previously, it was demonstrated that Ki-1/57 undergoes phosphorylation by PKCs and methylation by PRMT1, an arginine methyltransferase that modulates many RNA binding proteins. Here, the interaction of Ki-1/57 with RNA polyuridine a
Publicado em: 2009
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10. Análise sub-ppm de flúor em água pela técnica PIGE / SUB-PPM analysis of fluorine in water by the Pige technique
This work presents a new method for the analysis of fluorine in water, at the tenth of ppm concentration level, based on the PIGE (Particle-Induced Gamma-ray Emission) technique. It is shown that determination of concentrations of this order of magnitude by PIGE requires the use of a preconcentration method. Some attempts of preconcentration of fluorine by a
Publicado em: 2008
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11. INFLUENCE OF SYNTHESIS PARAMETERS IN THE PROPERTIES OF MCM-22 ZEOLITE / INFLUÊNCIA DOS PARÂMETROS DE SÍNTESE NAS PROPRIEDADES DA ZEÓLITA MCM-22
MCM-22 zeolite was first synthesized by Mobil researchers in 1990. It is an aluminosilicate with molecular sieve characteristics and several applications in catalytic processes because of its two independent pore systems. In this work, the MCM-22 zeolite synthesis conditions were studied using both static as stirred hydrothermal treatment. Molar composition
Publicado em: 2008
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12. Estudo da formação de rastos nucleares em polímeros / Study of the Nuclear Tracks Formation in Polymers
The research in the field of material modification with ion implantation has greately improved, stimulated by technological applications in biology, medicine, electronics and other related areas. One of the correlated aspects in understanding these new materials is the identification and characterization of the damage produced by ion beam irradiation. In thi
Publicado em: 2007